Dipper trip



Oct. 27, 193-1. F. A FULLER ET AL 1,823,965

DTPPER TRIP Filed Jan. 23. 1929 I 2 Sheets-Sheet 1 INVENTORS A TTOR;\'EYS.

Oct. 27, 1931.

F. A. FULLER ET AL DIPPER TRIP Filed Jan. 23, 1929 yz/ foz 2 Sheets-Sheet 2 f I f Miler /@a0re IN VENTORS.

TTORNEYS.

Patented Oct. 27, 1931 PATENT OFFICE FRANK A. FULLER AND CARL I. M ORE, OF ERIE,

SOUTH MILWAUKEE,

BUCYRUS-EBIE COMPANY, DELAWARE PENNSYLVANIA, ASBIGNOBB TO WISCONSIN} A CORPORATION OF DIPPER TRIP Application filed January 23, 1929. Serial No. 334,510.

Our invention relates to new and useful improvements in dipper trips. I a Power-shovels are well known in the excavating art. They have a boom, with a dipper and dipper handle mounted thereon for motion with respect to a fixed pivot, located about half way up the boom, known as the shipper-shaft. A hoist-rope, passing from the dipper, over a sheave at the outer point 1 'of the boom, to a winch on the main frame of the excavator, serves to move the dipper in a circle about the shipper-shaft, this motion being known as hoisting. A boom-engine serves to rotate the shipper-shaft, thus reciprocating the handle, and thus moving the dipper radially with respect to the shippershai't, this motion being known as thrusting. All the digging operations are performed by a proper combination of hoisting and thrusting, at the will of the operator.

The contents of the dipper are dumped by means of a hinged door on the bottom of the dipper, which door is released by a. latch. To trip this latch in a. convenient manner has exercised the ingenuity of many inventors. The usual manner is by means of a rope running from the latch to the operators station; but, dueto the reciprocation and swinging of the dipper-handle this rope has to be repeatedly paid out and pulled in, so that it may always be almost taut, in readiness for tripping, and yet shall not accidentally become too taut, and thus trip when tripping is not desired.

The object of the present invention is to provide means for automatically paying out and pulling in the trip-rope; and for imparting, when desired, the necessary additional pull to trip the dipper.

The invention consists in the novel parts, and in the combinations and arrangements thereof, which are defined in the appended claims; and of which one embodiment is exemplified in the accompanying drawings which are hereinafter particularly described and explained.

Throughout the description, the same reference number is applied to the same member or to similar members.

herein merely for Figure 1 is a side elevation of a power shovel embodying our invention.

Figure 2 is a vertical longitudinal section of the rope-drum and associated elements, taken along the line 2-2 of Figure 1.

Figure 3 is an end view of the rope-drum and associated elements, taken along the line of Figure 2. 1

Figure 4 is a vertical cross section of the drum and associated elements, taken along the line -14 of Figure 2.

Referring to Figure 1, it will be seen that 11 is the boom of a power shovel,,suspended by rope 12. A boom-engine 13 rotates the shipper-shaft (not shown on this figure) which carries with it the drum 14, and one or more pinions, of the same diameter as the drum, and-hidden by the drum in this figure. Each pinion engages a rack 15 on the handle At the outer end of the handle is a dipper 17 with hinged dump-door 18 and latch 19. A rope 10 serves to hoist and lower the dipper. From the latch, a chain 20 runs to a bar 21 on the handle, around which bar, the chain is wound. A lever 22 atfixed to the bar, serves to rotate it, and thus pull on the chain. A rope 23, fastened to the end of the bar, serves to pull on the lever, and thus rotate the bar.

It is, of course, to be understood that the method in which rope 23 operates the latch of the dipper does not form a part of our invention, and may be arranged in any convenient manner. It is shown and described the sake of completeness.

The other end of the rope 23 is wound around the shipper-shaft drum 14:. So that as the shipper-shaft pinions rotate, and thus cause the handle to reciprocate, the drum 14 will, to a substantially e ual extent, payout or take in the rope 23. t now remains only to give a slight additional rotation to the drum 14, relative to the shipper-shaft, in order to trip the dipper.

This is'accomplished as follows. See Figures 2, 3 and 4.

The shipper-shaft 24 has a helix 25 secured in its end. Between a stop 26 on this helix and the end of the shipper-shaft, is journalled the drum 14. The inside of the drum is bored 100 tween the piston and either cylinder 27 and the shaft 29 of the helix.

A cylinder-head 36 closes the end of the cylinder. Fluid under pressure is admitted through three way valve 37 and pi 38 (for 37 an 38, see Figure 1) to the ole 39 in bushing 40 and Lgland 41, and thence to the chamber 42; an through orifices 43 in the cylinder-head 36, to the space 44 between the cylinder and the piston.

Sprin 45, between piston 30 and the inside end of rum 14, is compressed by the action of the fluid pressure on piston 30, and serves to return the iston to its original position when the flui pressure is re eased. Compression of air in the dead end 46 of the cylinder is relieved through the hole 47.

It will be seen, from the foregoing description, that whenever fluid under pressure is introduced, the piston 30 will be driven to the right, along t e helix 25, thus causing the iston to rotate. This rotation is communicated to the combined drum cylinder, throu h recesses 31 and feathers 28, thus causing t e drum to rotate with the iston and hence to pull in on the rope 23 an trip the dipper.

One of the sh1pper-shaft pinions 1s shown at 48 in Figure 2.

Having now described and illustrated one form of our invention, we'wish it to be understood that our invention is not to be limited to the specific form or arrangement of arts hereinbefore described, except in so ar as such limitations are specified in the ap ended claims.

1 e claim:

1. In a mechanical movement, the combination of: a cylinder; a piston therein; a cylinder head; a helical element, helically keyed to the piston; and means for introduc ing fluid under pressure into the cylinder between the cylinder head and the piston, whereby to cause relative translation, and hencerelative rotation, between the piston and the helical element.

2. In a mechanical movement, the combination of: a cylinder; 8. iston therein and keyed thereto; a cylinder ead; a helical element, helically keyed to the iston; and means for introducing fluid un er pressure into the cylinder between the cylinder head and the piston, whereby to cause relative translation between the piston and the helical element, and hencerelative rotation between the cylinder and the helical element.

3. In a mechanical movement, the combimasses nation of: a shaft; a cylinder mounted thereon, for rotation selectively with or with respect to the shaft, but not for translation with respect to the shaft; a helix within the cylinder, and rotatable with the shaft; a piston within the cylinder, slidably keyed to each of the cylinder and the helix; a c linder head; and means for introducing flui under pressure into the cylinder between the cylinder head and the piston, whereby to cause relative translation of the piston and the shaft, and hence relative rotation between the c linder and the shaft.

4. In a mechanical movement, the combination of: a cylinder; a piston therein; a cylinder head; a helical element, helically keyed to the piston; means for introducing fluid under pressure into the cylinder between the cylinder head and the piston,.,whereby to cause relative translation, and hence relative rotation, between the piston and the helical element; and means to restore the original relative position of the cylinder and the piston.

5. In a mechanical movement, the combination of a cylinder; a piston therein and keyed thereto; a cylinder head; a helical element, helically keyed to the piston; means for introducing fluid under pressure into the cylinder between the cylinder head and the piston, whereby to cause relative translation between the piston and the helical element, and hence relative rotation between the cylinder and the helical element; and means to restore the original relative position of the cylinder and the piston.

6. In a mechanical movement, the combi-' nation of: a shaft; a cylinder mounted thereon, for rotation selectively with or with respect to the shaft, but not for translation with respect to the shaft; a'cylinder head; a helix within the cylinder, and rotatable with the shaft; a piston within the cylinder, slidably keyed to each of the cylinder and the helix; means for introducing fluid under pressureinto the cylinder between the cylinder head and the piston, whereby to cause relative translation of the piston and the shaft, and hence relative rotation between the cylinder and the shaft; and means to restore the original relative position of the cylinder and the piston.

7 In a mechanical movement, the combination of: a cylinder; a piston therein; a cylinder head; a helical element, helically keyed to the piston; means for introducing fluid under pressure into the cylinder between the cylinder head and the piston, whereby to cause relative translation, and hence relative rotation, between the piston and the helical element; and a spring being compressed by the action of the fluid, and serving to restore 'the original relative position of the cylinder and the piston.

8. In a mechanical movement, thecombination of: a cylinder; a piston therein and keyed thereto; a cylinder head; a helical element, helically keyed to the piston; means for introducing fluid under ressure into the cylinder between the cylin er head and the piston, whereby to cause relative translation between the piston and the helical element, and hence relative rotation between the cylinder and the helical element; and a spring being compressed by the action of the fluid, and serving to restore the original relative position 0 the cylinder and the piston.

9. In a mechanical movement, the combination of: a shaft; a cylinder mounted thereon, for rotation selectivel with or wi-.h respect to the shaft, but not or translation with respect to the shaft; a cylinder head; a helix within the cylinder, and rotatable with the shaft; a piston within the c linder, slidably keyed to each of the cylin er and the helix; means for introducing fluid under pressure into the cylinder between the cylinder head and the piston, whereby to cause relative translation of the piston and the shaft, and hence relative rotation between the cylinder andthe shaft; and a spring being compressed by the action of the fluid,

and servin to restore the original relative position 0 the cylinder and the piston.

10. In a mechanism for actuating a dippertrip rope, the combination of: a shaft; a cylinder mounted thereon, for rotationselee tivel with or with respect to the shaft, but not or translation with respect to the shaft; a rope drum rotatable with the cylinder; a helix within the cylinder, and rotatable with the shaft; a cylinder head; a piston within the c linder, slidably keyed to each of the cylinder and the helix; means for introducing fluid under pressure into the cylinder between the cylinder head and the piston, whereby to cause relative translation of the piston and the shaft, and hence relative rotation between the cylinder and the shaft; and means to restore the ori inal relative position of the cylinder and t e piston.

11. In amechanism for actuating a dippertrip rope, the combination of: a shaft; a c linder mounted thereon, for rotation select1vel with or with respect to the shaft, but

7 not or translation with res eat to the shaft;

a rope drum rotatable wit the cylinder; a helix within the cylinder, and rotatable with the shaft; a cylinder head; a piston within the cylinder, slidably keyed to each of the cylinder. and the helix; means for introducing fluid under pressure into the cylinder between the cylinder head and the piston, whereby to cause relative translation of the piston and the shaft, and hence relative rotation between the cylinder and the shaft; and a spring being compressed by the action of the fluid, and servin to restore the'original. relative position of t e cylinder and the pisli t0 Q 12. In a mechanism for actuating a dippertri rope, the combination of: a shaft; a cylinder mounted thereon, for rotation selectivel with or with respect to the shaft but not or translation with respect to the shaft, and having its outer surface formed to constitute a rope-drum; a helix within the cylinder, and rotatable with the shaft; a cylinder head; a piston within the c linder,

slidably keyed to each of the cylin er and the helix; means for introducing fluid under pressure into the cylinder between the cylinder head and the piston, whereby to cause relative translation of the piston and the shaft, and hence relative rotation between the cylinder and the shaft; and means to restore the ori 'nal relative position of the cylinder and t e piston.

13. Inamechanism for actuatingadi pertrip rope, the combination of: a sha a cylinder. mounted thereon, for rotation selecthe cylinder and the shaft; and a sprin being compressed by the action of the uid,

and serving to restore the original relative position of the cylinder and the piston.

In testimony whereof they aflix their signatures.

FRANK A. FULLER. CARL M. MOORE. 

